(nautical) a short spar, at the bows of a ship, that serves as a flagpole to fly a flag (a jack)

plural of jackstaff

plural of jackshaft

A common mechanical component used to transfer or synchronize rotational force in a machine. / A wheelless axle used to turn the wheels of a locomotive.

To transfer or synchronize rotational force by means of a jackshaft.

plural of jackscrew

plural of jacksnipe

plural of jackstone

plural of jacksy plural of jacksie

A jack; one of the playing pieces in the game of jacks.